LIFE DETECTION OF SEALED STORAGE BATTERY

摘要

PURPOSE:To display an alarm by correctly detecting life lowering of a sealed storage battery of a uninterruptible power supply device by a proper technique for automization. CONSTITUTION:A prescribed amount of discharge current is made to flow for a fixed time from a seal storage battery 7 of a non-service interruption power supply device 1 to a discharge circuit 11 every set-up term and voltage of the storage battery 7 is detected at an end time of said fixed time for being compared with a reference value, and when voltage of the storage battery 7 is lower than a reference value of voltage, life lowering of the storage battery 7 is detected so as to display an alarm by means of an alarm displayer 18.